<template>
  <div id="app">
    <!-- 顶部固定导航 -->
    <mt-header fixed title="黑马程序员vue项目">
      <span @click="back" slot="left" v-if="flag">
        <mt-button icon="back">返回</mt-button>
      </span>
    </mt-header>
    <!-- 路由切回区 -->
    <transition>
      <router-view></router-view>
    </transition>

    <!-- 底部导航区 -->
    <nav class="mui-bar mui-bar-tab">
      <router-link class="mui-tab-item1" active-class="mui-active" to="/home">
        <span class="mui-icon mui-icon-home"></span>
        <span class="mui-tab-label">首页</span>
      </router-link>
      <router-link class="mui-tab-item1" active-class="mui-active" to="/member">
        <span class="mui-icon mui-icon-contact"></span>
        <span class="mui-tab-label">会员</span>
      </router-link>
      <router-link class="mui-tab-item1" active-class="mui-active" to="/shop">
        <span class="mui-icon mui-icon-extra mui-icon-extra-cart"
          ><span class="mui-badge" id="badge">{{
            $store.getters.num
          }}</span></span
        >
        <span class="mui-tab-label">购物车</span>
      </router-link>
      <router-link class="mui-tab-item1" active-class="mui-active" to="/search">
        <span class="mui-icon mui-icon-search"></span>
        <span class="mui-tab-label">搜索</span>
      </router-link>
    </nav>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return { flag: false };
  },
  methods: {
    back() {
      this.$router.go(-1);
    },
  },
  created() {
    this.flag = this.$route.path === "/home" ? false : true;
  },
  watch: {
    "$route.path"(newVal) {
      newVal === "/home" ? (this.flag = false) : (this.flag = true);
    },
  },
};
</script>

<style lang="less" scoped>
#app {
  overflow-x: hidden;
  padding-top: 40px;
  padding-bottom: 50px;
  .v-enter {
    transform: translateX(100%);
  }
  .v-leave-to {
    transform: translateX(-100%);
    position: absolute;
  }
  .v-enter-active,
  .v-leave-active {
    transition: all 0.5s;
  }
  .mui-bar-tab {
    a {
      touch-action: none;
    }
  }
  //解决tab选项卡使用后，底部选项卡不能点击切换的bug  原因是 样式冲突
  .mui-bar-tab .mui-tab-item1.mui-active {
    color: #007aff;
  }

  .mui-bar-tab .mui-tab-item1 {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
    .mui-icon {
      top: 3px;
      width: 24px;
      height: 24px;
      padding-top: 0;
      padding-bottom: 0;
    }
    .mui-tab-label {
      font-size: 11px;
      display: block;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }
}
</style>